Hypodermic syringe



M. J. COHEN HYPODERMIC SYRINGE 2 Sheets-Sheet 1 INVENTOR Milf@ ,z cohenATTORNEY Oct. 6, 1959 Filed March 2o, 195s SZICS My invention relates toa hypodermic syringe `and it is an object of the same to provideadisposable .syringe that shall be inexpensive as to materials-andassembly; that` can be put to use witha minimum of preliminaries,therefore being ravailable for use byvunskilled i persons or underunfavorable conditions such as strong cold or extreme heat orotherphysically unfavorable conditions; 'that shall be adapted tosterilize areas of skin adjacentl the point of application withthe leastpossible delay; that can also serve to deaden the nerves at such pointsto lessen shock to a patient and that can quickly warm to bodytemperature a syringe and the liquid that is to be injected, for thepurpose of reducing shock such as may result from the use of a coldsyringe and the injection of a cold liquid, the heating means being alsoavailable to thaw a frozen liquid in case of mecd..

Another object is to provide improved plungers for hypoderrnic syringes.

Still another object is to provide improved means for supporting theneedle in such asyringe.

Since it is of major importance to prevent any leakage of contents ofsuch syringes, as well as to prevent .entry of any foreign matter ofwhatever nature, and,to avoid contact of such contents with anymaterialthat-,might possibly react with such contents, I have provided a glassbarrel with means to seal lits, contents and with coacting parts ofrubber, neither the -rubbernor the glass I being subject torcorrosion byany'probablecontents of the syringe, nor chemically combinable with.such contents. f

Referring now to the annexed drawingaqwhich are made a part of thisapplication and in which similar reference characters indicate .similarparts;

Figure l is a longitudinal section of the device of my invention.

Figures 2, 3 and 4 sections respectively on lines 2-2, 3-3, and 4--4 ofFiglre l.

Figures 5 and 7 respectively a longitudinal section l.and an elevationof part of the vneedle end portion ofarnodilied form of the invention. Yj

Fig. 6, a longitudinal section of a portion of laimed# lication of theplunger of Fig. 1. f

Fig. 8, a longitudinal section of another form ofthe invention, and

Figs. 9, l0 and 1l, respectively transverse sections of Fig. 8 on lines9 9, 'l0-10, and -11-11.

In the drawings, reference .character 20 indicates the .f

glass barrel of a syringe in Figs. 1 `to 4, :said barrel having anintegral radial ange 21 at. one -end beneath which the fingers canengage in using the syringe, whileff the thumb bears on the head 22 of aplunger 23 for ejecting the contents of the chamber in the barrel inwell known manner. At the end of the barrel farthest from the flange 22there is a similar ange 24 that is connected to the body of the barrelby a neck 25. A washer 26 is positioned against the outer end face ofthe tlange 24 and a needle 27 is clamped in place by means of a metallicconnector 28 to which theneedle is xed by 2,967,323 Patented Oct. 6,1959 ice placing it in a central opening and swaging the metal about theneedle or. otherwise ailixing it thereto. lt will be seen that therubber washer seals the contents o the. chamber: against any leakage orcontact with the parts; at thel front end of the syringe except Vthatthe interior of the barrel connects with a hollow needle while all partsat that end are locked in place. by the metallic connector 28. Y r

In another.;=form, as shown in Fig..8, the needle 27 may be aiiixed to adisc 28a, 28b, 28e, clamped in place overa washerV 2.6 by a 'metal4connector 28', with the needle projecting through a central opening inthe connestor.

A cap'29 which may consist wholly or only in part of stretchablematerial such as rubber is engaged over the end of the syringe inposition to cover the needle and the .cap has a rim 30 engaging betweenthe opposed faces'fof the connector 28 and the barrel 20;.as shown in.Fig'.` l.. The rim need not fit precisely lbetween such faccsbut shouldmaintain the position indicated while being easily removable to exposethe needle and permit its uselin. the usual manner. A cavity about theneedle contains a pad' of fibrous material 30', which isimpregnatedfwith .a medicament such as antiseptic ointment. The innerend wall of the .cap is preferably. made of soft rubber vorlike'material'into whichv the end vof the needle may penetrate far.enough to sealthe passage thru the needle and thus prevent. leakage of.the .contents of the chamber yin barrel'Zi, awhile'A also locking theplunger against movement, .asf explained in my copending application.Ser'. No. 255,983, tiled. November 13, 1952. The antiseptic materialpreserves the needle and the pad 30' may be y,taken out and rubbed overthe area at which injection is totake place so asto prevent infection.

The plunger '23 is hollow and may consist essentially of a thin-walledlength of aluminum tubing having a jagged endcrimped about the sternV 31.of a plug 32 that has circumferential ridges to scrape the interior ofthe barrel. clean and vthus; insure use of all the contents 41 of thechamber in ybarrel .20, which are to be injected Y into the body of thepatient, said plunger also sealing the rear .end of the .chamber andretaining the liquid contents unt-il the syringe is to be used. Thehollow space in the plunger furnishes .a convenient storage place for afrangible .or crushable .ampule 3.3 containing anesthet-izing material,:the ampule being here l.shown as being pointed Aat Vits `rea-r end. Acap or cover 34 of rubber 0r .Other :flexible material iS psitioned atthe rear end of the plunger, said cover being shaped to -iit .over theliange 22 so as to hold the cover in place, and having a pointed portion3.5 into which the .capsule 3x3-can slide when the :syringe is tilted,said capsule tting more or less closelyin the cover. The cover has aport 35 in its pointed end, so that the contents of the capsule maypass/out .of the syringe when the capsule is .crushed by the fingers,vthe port being directed on the area of injection'surface, :whichprevents pain of `needle upon. entry intothelskim TheA empty cover cancollapse or fall overiagainst the plunger, but the Yflexible material ofthe cover :will Aprevent cutting of the. nsers fingers, as by fragmentsof the glass of au ampule and at .the saine time .allow.thunib'pressufre on the plunger lwithout discomtort. .Sparc needles orothersrnall articles can be. stored safely .in the interior .of theplunger if desired.v The dotted lines in Fig. 1 illustrate the positionthe capsule may assume in the cover when the syringe is tiltedpreliminary to the crushing of the capsule. Because disposable syringesand their contents may become uncoml fortably cold in winter or in coldclimates it is desirable to provide: means whereby they can easily andquickly be raised to body temperature, and for those reasons l haveadded to the device a heating means which is a modification of my PatentNo. 2,615,447, comprising a hollow sleeve having inner and outer .walls36 and 37 with a space between them, said sleeve being tapered at oneend at 38 so as not to interfere withl the entering of the users lingersbetween the sleeve and the flange 21. At its other end the sleevepreferably has an elastic collar 38' that grips the barrel 20 tightlyenough to resist free sliding of the sleeve along the barrel, thoughpermitting the removal of the entire sleeve from the barrel and at leastthe outer wall 37 is flexible. f

In the space between the Walls 36, 37 I place frangible capsules 39holding liquid such as water and the capsules are embedded in granularexothermic material 40 such as will emit heat when wet, as may be causedby kneading the flexible wall of the outer sleeve to break the capsulesandrelease their contents. v'The function of the water is to combinewith the material 4l) and emit heat, as by the combination of water withchemicals, eg., such as set forth in Patent No. 1,901,313to Mann. In theuse of this syringe the device can be tilted to cause the capsule 33 toenter the pointed portion `35 after which the capsule is crushed and itscontents ejected through port 35 and applied to the area to be treated,

to anesthetize the skin at that area.' The cap 29 may .w

be removed either before or after application and the pad 30 applied toskin area if desired to sterilize the same, after which the injectionmay follow at once if the temperature is mild. Otherwise, thereceptacles for capsules 39 before or after the preliminary treatment,may be kneaded to rupture them and injection may be postponed until theliquid in the barrel -is warmed. After injection the syringe isdiscarded.

In the modified formof Figs. 5 and` 7 all parts may previouslyelaborated so that the medicament is preserved -in full quantity andpurity until used.

. heating means in the sleeve, the heating means comprising granularexotherrnicl material with frangible liquidcontaining capsulesinterspersed among the granules and the sleeve being ilexible.

2. In a hypodermic syringe having 'a barrel, a needle z ixed atone endof the barrel and a plunger in the barrel,

be as above described but the cap 42.is made of metal or relativelyinelastic material with a notch in its skirt to permit limited expansionof the skirt. 'Ihe lower margin of the skirt is folded in to form aflange or hemlike part 44 that gives limited rigidity to the said marginwhich can snap past the adjacent margin of connector 28 to hold the capin place as shown in Fig. 5.

In Fig. 6 I have shown a modicd plunger, in which the tube 20" isconnected to thefpiston head 47 by one or more inwardly extendingcorrugations 46 that are pressed into the stem- ,of said head to holdthe head in place.

In the form shown in Figs. 8 to l1 the parts shown are generally thesame asthose above described, but the plunger consists of a rubber tube48 with an integral circumferentially corrugated head -49 and anintegral rear ilange 59. Since such a sleeve would serve as a plungerfor ejecting the contents of the syringe I have inserted a rod of steelor other rigid material to strengthen the plunger. l

At the needle end of the device the parts in this Aform of the inventionare as above described, but instead of swaging the needle into place inan aperture of the metallic connector I provide a special hub forholding the same. This hub consists of a washer-like flange 28a thatlies between the rubber washer 26 and an inwardly extending flange ofconnector 28. Integral with the flange 28a there is a forwardlyextending annular flange or mantle 28b supporting a boss 28C whichrisswaged about the shank of the needle 27 or otherwise rigidly fixedthereto. No leakage into or out of the medicament chamber is possibleand no contact of the medicament with material that can affect themedicament is possible as all parts of the syringe are glass, rubber oraluminum, the plunger cannot move out or in for reasons a sleevecomprising inner and outer cylindrical walls With a circumferentiallyextending space between them, at least the outer wall being ilexible,frangible waterilled capsules in said space, and granular exothermicmaterial lling the interstices between them.

3. In a hypodermic syringe, a barrel, a needle projecting from thebarrel, a tubular plunger in the barrel, a solid head closing one end ofthe plunger, a crushable capsule in'the plunger, a ilexible cover at theother end of the plunger, said cover shaped to contain the-capsule,

and a port in the cover.

4. A device as in claim 3, wherein the capsule is a glass ampule.

5. A device as in claim 4, wherein the ampule contains anaestheticmaterial.

6; A -device as in claim 3, wherein the capsule is pointed at one endand the cover has a point shaped to tit about the point of the capsule.

7. A hypodermic syringe comprising a barrel having 'l an annular flangeat one end, a reduced neck portion betweensaid flange and the body ofthe barrel, an elastic washer fitting against the outer face of saidllange, means for securingthe washer against the ilange including a diskbearing against the washer and having a portion bearing against the rearface of the llange, and a hypodermic needle permanently secured to thedisk.

8. In a hypodermicl syringe, a barrel, a needle permanently secured tothe barrel, a rubber plunger head Vin thebarrel, and a tubular plungerin the barrel, said tubular plunger having an open end portion crimpedabout a portion of said rubber plunger head and permanently securingsaid plunger to said plunger head.

References Cited in the lile of this patent UNITED STATES PATENTS1,529,659 Marcy Mar. 17, 1925 1,961,490` Hein June 5, 1934 2,102,704Hein Dec. 2l, 1937 2,193,489 Nevin Mar. l2, 1940 2,538,390 SmithV Ian.16, 1951 2,542,814 Hoskins Feb. 20, 1951 2,615,447 Cohen Oct. 28, 1952FOREIGN PATENTS 103,440 Great Britain Ian. 25, 1917 297,644 Germany' May4, 1917 'f4-54,775 Great Britain Oct. 7, 1936 l ,957,829 France Aug. 29,1949

